Which military customer feedback innovation from WWII directly inspired the Net Promoter Score (NPS) system widely used in modern retail?

During World War II, military organizations pioneered advanced methods for gathering and analyzing intelligence that later revolutionized commercial market research and customer feedback systems. This poll tests your knowledge of how military intelligence gathering techniques evolved into modern business practices that companies still use today for understanding consumer behavior and product performance in the field.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

The AAR (After Action Review) protocol used by US Army units to evaluate mission success and identify improvements needed for equipment and tactics
The RAF's Aircraft Damage Assessment forms that tracked which parts of returning bombers needed most frequent repair
German Wehrmacht's 'Field Operational Satisfaction Index' that measured soldier confidence in their equipment
Soviet Red Army's 'Combat Readiness Questionnaire' that ranked weapons systems on a 1-10 scale of reliability